TOUCH SYSTEM AND CALIBRATION METHOD FOR TOUCH SYSTEM AND MEDIUM, AND METHOD FOR DETERMINING POSITION OF OBJECT RELATIVE TO REFERENCE FRAME USING TRIANGULATION FROM CAPTURED OBJECT IMAGE

摘要

PROBLEM TO BE SOLVED: To provide a novel method for calculating the offset of a camera in order to determine a position of an object easily using a triangulation. SOLUTION: A touch system comprises a reference frame and at least two cameras having a field of view overlapping each other in the reference frame. The position of the object relative to the reference frame is determined based on the triangulation from an image which the object is captured. The image of the object is collected from at least one place in the reference frame by using each of at least two cameras, and the position of the object in each image relative to each place is represented by an angleϕ, and the position of the object in each image is determined so that the angle is equal to the angle formed between the limit of the field of view extending over the reference frame and a straight line extending from the camera and crossing the object in the image. COPYRIGHT: (C)2009,JPO&INPIT